DronesWorks - Aerial Data For Stockpile Survey

oh way too chilly [Music] hey everyone jason from droneworks on site again for another construction progress visit where we take aerial visuals and collect site survey data to provide the site manager and engineers with the data they need to help keep the project on track today we're talking stockpiles so when we're collecting this survey data we also can collect the data about stockpiles because they're part of the levels of the ground that we extract from the images taken by the drone stockpiles are generally assessed regularly of part of the inventory of the site so we may have a pile of aggregate that's been imported that needs to be used to fill the site to the threat level we may have some waste that needs to be exported from site which costs to be taken away and so it's important that the site manager knows exactly what volume they have what they're dealing with so they can manage their inventory correctly in order to keep the project running smoothly so we can either cover the whole site with the drone or just cover the stockpile in general but either way gcps are used as we talked about in my previous video so we're going to jump into the pc now have a look at this stockpile behind me and see if uh show you how we can determine the volume i'll see in the computer okay so back at the office now i'm going to talk about how do we extract volumetric and useful site data from the drone imagery so how do we do it with the drone so after the standard planning and risk assessment which we do from the office we arrive on site and conduct conduct our on-site assessment we'll place out ground control so you can see here the green crosses the various ground controls points we've recorded using an rtk receiver and once the dcps are positioned and surveyed the drone operator can then fly the drone and mark the entire site automatically by taking multiple pictures and the drone is automated to cover the whole site not just the stockpile so we have a complete snapshot of the site data not just the stockpile that we're interested in although you can just do the stockpile if you wanted so for this site we flew at 45 meters above ground level this gave us a a gsd of around 1.2 centimeters per pixel so we took around 1100 images it was all collected in under an hour and the images have now been processed tied into the gcps using the photogrammetry software and the outputs are used to create this model that you see here so we've got the point cloud the author mosaic which is basically a detailed 2d google map where every pixel has an xyz coordinate a terrain model and a surface model so the drone survey of this site or any site will generate hundreds of data points per square meter this means that we get a much richer data set than traditional methods which factors in all of the stockpile surface so if you see on this one here this stockpile is not quite uniform we've got some divots here where material has been extracted so all those irregularities are captured into the data set that we're working with so to estimate the volume here using the outputs we're viewing the terrain each coordinate has an xyz position so if you look down here you can see as i move the cursor the coordinate of this cursor is also moving including the height which is the z-axis so first we need to tell the software where is the base of the stockpile that we're interested in exactly the same way as a surveyor will do it so here we're in virtual surveyor which has got some really useful tools to make this nice and easy so we're going to draw our baseline it should try and work out the base for us to speed things up so there we go so now we've got our boundary of the the base of the stockpile we now uh can use that boundary for the software to extract the height information from the thousands of data points that are above the stockpile layers and provide cut and fill calculations so if we select our boundary triangulate that boundary which creates a surface the software can then calculate the volume for us and here you can see now it's giving us a total volume a cut volume and a fill volume so cut is the amount of material we need to extract from the pile to level the area with the surrounding ground the fill is the volume of material we'd need to add to a hole or a trench to level the area with the surrounding ground so volume equals cut minus fill so here you can see we've got around 1800 meters cubed of a volume in the stockpile the colors just denote the height of the stockpile so yellow is lower red is a higher elevation based on the coordinates of the pixels that make up the stockpile so now we've got that we can extract it to cud we can give the site engineers a tin so they can then work with the data in a format that they're familiar with and due to the speed and ease of this process we can repeat it as often as required so we can collect multiple data sets of a project that say weekly or bi-weekly and we can use that to compare one visit against the next um track the say the usage of this stockpile or even track the levels on the on the whole site we can overlay cad drawings compare it to design against as is and this this is all down to giving more information to the site manager and site engineers to allow them to keep projects on track if we wanted to just as a another example but this is only quick um a land surveyor would say normally uh roam this site collecting uh a point grid at say let's say five or ten meter spacing which involve them walking along this ground every five meters collecting a data point with our rtk receiver we can do that quite quickly in the software now because every point on here has an xyz coordinate now normally we would clean this data because if we zoom in there's multiple trees and small elevations in the ground so we'd spend some time cleaning that up to make sure we've got accurate data but if we uh we can generate the point grid automatically this only takes a few minutes and here now you can see all the data points where there are any changes in elevation around the site we can then use those to create a tin a surface model and again give that to the surveyor or site engineer so you can see now how using this software we can get the drone data into a format the site engineers and surveys are used to working with we can work closely together to make sure the data is accurate and gives them all the information they need but more importantly it saves them time because we've collected the data quite quickly we've got more data than would normally be available and all this is all uh more data is just good for um for keeping track of things so that's it for now it's just a quick example but just to show you the power of um of the drone data that we've collected the speed and the the efficiencies that it brings along with the extra data um that and with that more data is is more knowledge to keep our projects on track so thanks and we'll see you next time

Channel: DroneWorksUK

Views: 11,478

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Id: Orz9Tn6yoRo

Length: 8min 51sec (531 seconds)

Published: Mon Nov 16 2020